PrimaryKey

```
@Target({TYPE,FIELD,METHOD})
@Retention(RUNTIME)
public @interface PrimaryKey
```
Annotation on a member to define it as a primary key member of a class or persistent interface using application identity. Also used to define the primary key columns of a secondary table. Corresponds to the xml element "primary-key".

Since:

2.1

Version:

2.1

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`java.lang.String`	`column`	Name of the column to use for the primary key
`Column[]`	`columns`	The column(s) for the primary key
`Extension[]`	`extensions`	Vendor extensions.
`java.lang.String`	`name`	Name of the primary key constraint

- Element Detail
  - name
```
java.lang.String name
```
    Name of the primary key constraint
    
    Returns:
    
    the name of the primary key constraint
    
    Default:
    
    ""
- - column
```
java.lang.String column
```
    Name of the column to use for the primary key
    
    Returns:
    
    the name of the column to use for the primary key
    
    Default:
    
    ""
- - columns
```
Column[] columns
```
    The column(s) for the primary key
    
    Returns:
    
    the column(s) for the primary key
    
    Default:
    
    {}
- - extensions
```
Extension[] extensions
```
    Vendor extensions.
    
    Returns:
    
    the vendor extensions
    
    Default:
    
    {}